SOSTAC Marketing Planning Model is a process-based marketing planning model that helps marketers to plan, monitor and assess the performance of their marketing activities. SOSTAC Marketing Planning Model is an acronym for Strategic Objectives, Strategy, Operations, Tactics and Communication. It is a marketing planning model designed by Dr. John Sostac in the year 1979. The model helps marketers to plan, monitor and assess the performance of their marketing activities by focusing on four key aspects: strategy, operations, tactics and communication. The main advantage of this model is that it provides a clear approach for marketers to follow when developing their marketing plans.